685316 has 6 divisors (see below), whose sum is σ = 1199310. Its totient is φ = 342656.

The previous prime is 685301. The next prime is 685319. The reversal of 685316 is 613586.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 92416 = 770^2 + 304^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685319) by changing a digit.

685316 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85661 + ... + 85668.

It is an arithmetic number, because the mean of its divisors is an integer number (199885).

2⁶⁸⁵³¹⁶ is an apocalyptic number.

It is an amenable number.

685316 is a deficient number, since it is larger than the sum of its proper divisors (513994).

685316 is a wasteful number, since it uses less digits than its factorization.

685316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171333 (or 171331 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 685316 is about 827.8381484324. The cubic root of 685316 is about 88.1651512960.

It can be divided in two parts, 685 and 316, that added together give a palindrome (1001).

The spelling of 685316 in words is "six hundred eighty-five thousand, three hundred sixteen".